Number Crunchers
Simplify –7 + 15.
8
Expand (x + 5)(x + 2).
x² + 7x + 10
How many degrees in a straight angle?
180°
Find the mean of 4, 8, 10.
7.33
I am a two-digit number. My digits add to 9. I am a multiple of 9. What am I?
18, 27, 36, 45, 54, 63, 72, 81
Evaluate 3² × 4 – 5
31
Solve 2x – 7 = 13.
x=10
Find the perimeter of a rectangle 12 cm × 8 cm.
40 cm
A coin is tossed. Probability of heads?
1/2
Double me and add 6 = 20. What number am I?
7
Write 0.0045 in scientific notation.
4.5 × 10⁻³
Factorize x² – 9.
(x – 3)(x + 3)
Area of a circle with radius 7 cm (π = 3.14)
153.86 cm²
Find the median of 2, 5, 7, 10, 15.
7
What is the next term? 2, 4, 8, 16, …
32
Simplify (–2)³ × (–5).
–40
Simplify (2x + 3) – (x – 5).
x + 8
Find the volume of a cube with side 5 cm.
125 cm³
A die is rolled. Probability of a multiple of 3?
1/3
I am a prime number between 20 and 30. Who am I?
23 or 29
Find the LCM of 18 and 24.
72
Solve 3(x – 2) = 2x + 7.
x=13
A right triangle has legs 6 cm and 8 cm. Find the hypotenuse
10 cm
Find the mode of {2, 3, 5, 3, 6, 3, 2}
3
A farmer has 17 sheep. All but 9 run away. How many are left?
9